Robtex

Up: 31.20.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 31.20.0.0/18
Down right: 31.20.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.20.0.0	PTR	0-0-20-31.ftth.glasoperator.nl
31.20.0.132	A+PTR	132-0-20-31.ftth.glasoperator.nl
31.20.0.132	A	tonroovers.com
31.20.8.37	A	mail.creatiefactory.nl
31.20.29.166	A+PTR	166-29-20-31.ftth.glasoperator.nl
31.20.35.54	A+PTR	54-35-20-31.ftth.glasoperator.nl
31.20.35.54	A	dverdons.com
31.20.40.249	A+PTR	249-40-20-31.ftth.glasoperator.nl
31.20.40.249	A	stedgym.net
31.20.40.249	A	sickcrew.com
31.20.41.199	PTR	199-41-20-31.ftth.glasoperator.nl
31.20.43.194	A+PTR	194-43-20-31.ftth.glasoperator.nl
31.20.43.194	A	itsalwaysme.nl
31.20.45.78	A+PTR	78-45-20-31.ftth.glasoperator.nl
31.20.47.103	A+PTR	103-47-20-31.ftth.glasoperator.nl
31.20.49.209	PTR	209-49-20-31.ftth.glasoperator.nl
31.20.52.66	A+PTR	66-52-20-31.ftth.glasoperator.nl
31.20.52.66	A	anitasredzone.com
31.20.52.66	A	anita.bz
31.20.52.74	PTR	74-52-20-31.ftth.glasoperator.nl
31.20.53.230	A+PTR	230-53-20-31.ftth.glasoperator.nl
31.20.56.44	A+PTR	44-56-20-31.ftth.glasoperator.nl
31.20.77.44	A+PTR	44-77-20-31.ftth.glasoperator.nl
31.20.95.198	A+PTR	198-95-20-31.ftth.glasoperator.nl
31.20.95.198	A	blork.nl
31.20.95.223	A+PTR	223-95-20-31.ftth.glasoperator.nl
31.20.95.223	A	blapplify.hopto.org
31.20.104.12	A+PTR	12-104-20-31.ftth.glasoperator.nl
31.20.104.12	A	rb-photography.nl
31.20.115.155	A	holland-actief2.no-ip.com
31.20.117.80	A+PTR	80-117-20-31.ftth.glasoperator.nl
31.20.117.80	A	smartsilva.com
31.20.123.133	A+PTR	133-123-20-31.ftth.glasoperator.nl
31.20.123.133	A	steijvers.net
31.20.126.14	A+PTR	14-126-20-31.ftth.glasoperator.nl